My 1950 Plymouth 217 ended up having a bad crankshaft. Friend gives me cracked block lying on ground for years. Took it apart and crank was standard. Had it cleaned & polished. I was re-reading manual on engine assembly and discover that the 1953 crankshaft can't be used in any earlier engine. The difference appears to be the rear oil seal. Measured everything imagineable and the cranks are the same with same casting number. I hope to put the '53 crank in the '50 block and use the '50 rear oil seal. Will it work? Is there a problem with the front oil seal? Are the front oil seals and pulleys the same? They look it. Appreciate any advice. Thanks, Carl